I'm glad you like the shell idea.
It was an approach to create a visual variation with reasonable render effort.
34 Mil is great. During testing whenever I have 8 Mill or more I feel already good about.
There are Bot experts though who push the boundary. Best I have seen is a non-escaping Bot for 134 Mil. (Galaxina Shell). I assume with heavy backscrolling/rerolling for the addons...
Thats why I introduced the MV Pod idea which enables you to carry those bots forward into your next/new game iteration.